What is the earliest sign of puberty in girls?
A. The appearance of sebaceous and axillary glands
B. The onset of breast development
C. The appearance of pubic and axillary hair
D. The first menstrual period
E. The increase in muscle mass
Answer: B
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The process by which molecules such as glucose are moved into cells along their concentration gradient with the help of membrane-bound carrier proteins is called
A) osmosis. B) facilitated diffusion. C) active transport. D) endocytosis. E) exocytosis.
If stroke volume is 80 ml and the heart rate is 70 beats per minute, the cardiac output is
a. 150 ml/min b. 560 ml/min c. 5,600 ml/min d. 8,700 ml/min e. none of the above
True or False? The importance of O2 in the human body is to extract energy (ATP) from food molecules.
Answer the following statement true (T) or false (F)
Adding one gram of NaCl to one liter of water will lower the water concentration twice as much as adding one gram of glucose
Indicate whether the statement is true or false.